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I need to save the status of the checkboxes in the subgalley (checked/unchecked), So that:
If user clicked anywhere on the screen but the OK button, the checkbox-galley disappears, and when the user comes back to the subgallery, he finds the checkboxes are intact.
The checkboxes' status are not saved unless the OK button is clicked. In other words, the staus of the checkboxes are not saved only through the OK button.
Please see the animated picture.
The sub-gallet filter the data source for records matching the text in the checkboxes (Excel style filtering)
The GIF isn't very clear, but what I understood is that you want to preserve the state of the checkboxes when the user clicks anywhere on the screen? If yes, you need to PATCH the underlying collection, UI only reflects what is available in the data.